In Los Angeles area I think bringing your own alcoholic beverage to a restaurant is allowed, if the restaurant does allow it. I did hear about a restaurant in Los Angeles area which allows customers to bring own bottle of wine, but no other alcoholic beverage is allowed. So I am guessing that the local law in Los Angeles does allow bring you own alcoholic beverage. But I have a feeling that not many restaurants in Los Angeles area do allow customers to bring own alcoholic beverages.